bsd/netinet/ip_ecn.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (C) 1999 WIDE Project.
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. Neither the name of the project nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  *
  50  * $Id: ip_ecn.c,v 1.3 2000/11/22 01:12:12 zarzycki Exp $
  51  */
  52 /*
  53  * ECN consideration on tunnel ingress/egress operation.
  54  * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
  55  */
  56
  57 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
  58 #include "opt_inet.h"
  59 #endif
  60
  61 #include <sys/param.h>
  62 #include <sys/systm.h>
  63 #include <sys/malloc.h>
  64 #include <sys/mbuf.h>
  65 #include <sys/errno.h>
  66
  67 #if INET
  68 #include <netinet/in.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #endif
  72
  73 #if INET6
  74 #ifndef INET
  75 #include <netinet/in.h>
  76 #endif
  77 #include <netinet/ip6.h>
  78 #endif
  79
  80 #include <netinet/ip_ecn.h>
  81
  82 /*
  83  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
  84  * call it after you've done the default initialization/copy for the outer.
  85  */
  86 void
  87 ip_ecn_ingress(mode, outer, inner)
  88         int mode;
  89         u_int8_t *outer;
  90         u_int8_t *inner;
  91 {
  92         if (!outer || !inner)
  93                 panic("NULL pointer passed to ip_ecn_ingress");
  94
  95         switch (mode) {
  96         case ECN_ALLOWED:               /* ECN allowed */
  97                 *outer &= ~IPTOS_CE;
  98                 break;
  99         case ECN_FORBIDDEN:             /* ECN forbidden */
 100                 *outer &= ~(IPTOS_ECT | IPTOS_CE);
 101                 break;
 102         case ECN_NOCARE:        /* no consideration to ECN */
 103                 break;
 104         }
 105 }
 106
 107 /*
 108  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
 109  * call it after you've done the default initialization/copy for the inner.
 110  */
 111 void
 112 ip_ecn_egress(mode, outer, inner)
 113         int mode;
 114         u_int8_t *outer;
 115         u_int8_t *inner;
 116 {
 117         if (!outer || !inner)
 118                 panic("NULL pointer passed to ip_ecn_egress");
 119
 120         switch (mode) {
 121         case ECN_ALLOWED:
 122                 if (*outer & IPTOS_CE)
 123                         *inner |= IPTOS_CE;
 124                 break;
 125         case ECN_FORBIDDEN:             /* ECN forbidden */
 126         case ECN_NOCARE:        /* no consideration to ECN */
 127                 break;
 128         }
 129 }
 130
 131 #if INET6
 132 void
 133 ip6_ecn_ingress(mode, outer, inner)
 134         int mode;
 135         u_int32_t *outer;
 136         u_int32_t *inner;
 137 {
 138         u_int8_t outer8, inner8;
 139
 140         if (!outer || !inner)
 141                 panic("NULL pointer passed to ip6_ecn_ingress");
 142
 143         outer8 = (ntohl(*outer) >> 20) & 0xff;
 144         inner8 = (ntohl(*inner) >> 20) & 0xff;
 145         ip_ecn_ingress(mode, &outer8, &inner8);
 146         *outer &= ~htonl(0xff << 20);
 147         *outer |= htonl((u_int32_t)outer8 << 20);
 148 }
 149
 150 void
 151 ip6_ecn_egress(mode, outer, inner)
 152         int mode;
 153         u_int32_t *outer;
 154         u_int32_t *inner;
 155 {
 156         u_int8_t outer8, inner8;
 157
 158         if (!outer || !inner)
 159                 panic("NULL pointer passed to ip6_ecn_egress");
 160
 161         outer8 = (ntohl(*outer) >> 20) & 0xff;
 162         inner8 = (ntohl(*inner) >> 20) & 0xff;
 163         ip_ecn_egress(mode, &outer8, &inner8);
 164         *inner &= ~htonl(0xff << 20);
 165         *inner |= htonl((u_int32_t)inner8 << 20);
 166 }
 167 #endif